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二茂铁有机磁/微波陶瓷在微带天线小型化和宽带化中的应用 被引量:1
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作者 林云 蒋虎南 +1 位作者 林展如 魏克珠 《功能材料》 EI CAS CSCD 北大核心 2013年第B06期153-156,共4页
研制了一类未见报道的二茂铁有机磁/BLT系微波陶瓷(OPM/BLT)磁性复合材料,用理论计算和相位延迟法得到的有效磁导率μe及有效介电常数ε十分接近,表明理论计算是获得有机磁材μe和εe的一个简便而实用的方法,用OPM/BLT(质量分数,%)制作... 研制了一类未见报道的二茂铁有机磁/BLT系微波陶瓷(OPM/BLT)磁性复合材料,用理论计算和相位延迟法得到的有效磁导率μe及有效介电常数ε十分接近,表明理论计算是获得有机磁材μe和εe的一个简便而实用的方法,用OPM/BLT(质量分数,%)制作的微带天线在1616MHz的带宽达8.6%,几何尺寸可缩小20.7%,并有良好的增益和轴比。因此,这种新型的有机磁复合材料可用最简单的结构设计实现微带天线的小型化与宽带化,在军工和高科技产品上有重要的应用价值。 展开更多
关键词 有机磁材 复合 微带天线 小型化与宽带化 应用
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Preparation of ferromagnetic metal fine fibers by organic gel-thermal reduction process 被引量:1
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作者 曹凯 沈湘黔 +1 位作者 景茂祥 周建新 《Journal of Central South University of Technology》 EI 2007年第5期607-611,共5页
The organic gel-thermal reduction process was used for the preparation of ferromagnetic metal Ni, Co and Fe fine fibers from the raw materials of citric acid, lactic acid and metal salts. The structure, thermal decomp... The organic gel-thermal reduction process was used for the preparation of ferromagnetic metal Ni, Co and Fe fine fibers from the raw materials of citric acid, lactic acid and metal salts. The structure, thermal decomposition process and morphologies of the gel precursors and fibers derived from thermal reduction of these gel precursors were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermo-gravimetric/differential scanning calorimetry and scanning electron microscopy. The results show that spinnability of gel largely depends on molecular structure of metal-carboxylate complex that is a linear-type structure formed in the gel. As a result, the gels exhibit a good spinnability. Metal Ni, Co and Fe fine fibers are featured with diameters of around 1 μm and a high aspect ratio up to 1×106. 展开更多
关键词 ferromagnetic metal fiber organic gel thermal reduction SPINNABILITY
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Analysis of Demagnetizer Operation Using the Finite Element Method
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作者 N. Morovvati H. Feshki Farahani +1 位作者 M. Sabaghi S.M. Pedram Razi 《Journal of Energy and Power Engineering》 2010年第2期58-64,共7页
Permanent magnets with high energy products are widely used in a variety of electromagnetic devices. Such devices can be found in marine, aerospace, and robotic applications which require the minimization of weight an... Permanent magnets with high energy products are widely used in a variety of electromagnetic devices. Such devices can be found in marine, aerospace, and robotic applications which require the minimization of weight and volume of the electromagnetic device. During the magnetizing process, the magnet may not be perfectly magnetized. Therefore, it needs to be demagnetized. Because of high coercivity of some permanent magnets, the demagnetization process requires the intense magnetic fields in close proximity with the magnetic material. The fields must be produced for a short period of time (millisecond range) and they also must be bidirectional in order to overcome the coercivity of magnetic material. Different parameters have been known to affect the demagnetizer operation such as the core shape, core material, turn number, cross section of air gap, magnet type and so on. The amplitude and waveform of the fixture current is obtained from PSPICE simulations and also from experimental measurement. A 2D finite element analysis is developed to simulate the magnetic fields and the mechanical forces. In this paper, the main parameters affecting the optimal design of the demagnetizer are discussed. Simulation results show that the core structure, air gap width, and turn numbers are the most important parameters when designing such a device. 展开更多
关键词 DEMAGNETIZER effective parameters FIXTURE finite element method ANSYS software.
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Organic-ferromagnetic hetero-structures with spin transport properties and fundamental physical effects 被引量:1
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作者 LIU DongPing HAN XiuFeng 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第1期151-165,共15页
Organic spintronics refers to control spin dependent transport through organic materials.In the last two decades,extraordinary development has been achieved for organic-spintronics.A series of theoretical and experime... Organic spintronics refers to control spin dependent transport through organic materials.In the last two decades,extraordinary development has been achieved for organic-spintronics.A series of theoretical and experimental studies have been done to reveal the mechanisms of spin dependent transport properties.The theoretical analysis is based on the non-equilibrium Green's function formalism provides a mathematical framework for solving the transmission coefficients in the Landauer formula from atomistic first principles without any phenomenological parameters.In this article,we provide a brief theoretical review on organic spintronics devices and device physics therein. 展开更多
关键词 organic SPINTRONICS spin dependent transport MAGNETORESISTANCE nonequilibrium green's function
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Highly efficient and broad electromagnetic wave absorbers tuned via topology-controllable metal-organic frameworks 被引量:5
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作者 Peng Miao Jianxin Chen +2 位作者 Yusheng Tang Kai-Jie Chen Jie Kong 《Science China Materials》 SCIE EI CSCD 2020年第10期2050-2061,共12页
Advanced electromagnetic(EM)wave absorbing materials with strong absorption and broad bandwidth are important for military stealth and elimination of microwave pollution in consumers’electronics.Metal organic framewo... Advanced electromagnetic(EM)wave absorbing materials with strong absorption and broad bandwidth are important for military stealth and elimination of microwave pollution in consumers’electronics.Metal organic framework(MOF)-derived metal/carbon hybrids with ordered structure are significantly urgent in this field.In this contribution,we presented a design strategy of hollow cage-like or solid box-like magnetic/dielectric Fe/Co/C and dielectric Fe/Mn/C EM wave absorbing nanomaterials via pyrolyzing Prussian blue’s analogs with controllable topology and phase composition.The solid box-like Fe/Co/C and hollow cage-like Fe/Mn/C showed favorable absorption property with a broad effective absorption bandwidth(EAB)and a low reflection loss(RL).Especially,the EAB of 8.8 GHz at a thickness of 2.5 mm for solid box-like Fe/Co/C nanocomplex prepared at 900℃is a new record for this type of materials.The design and tuning strategy for EM wave absorbers derived from topology-controllable MOF is important for EM functional materials possessing great potential in military stealth and consumers’electronics. 展开更多
关键词 electromagnetic wave absorber MOF Prussian blue's analogs TOPOLOGY PYROLYSIS
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Preface
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作者 高松 《Science China Chemistry》 SCIE EI CAS 2012年第6期865-865,共1页
In the past three decades, molecular magnetism has been a rapidly growing interdisciplinary field in chemistry, phys- ics and materials sciences. It covers diverse range of topics including inorganic/organic/hybrid ma... In the past three decades, molecular magnetism has been a rapidly growing interdisciplinary field in chemistry, phys- ics and materials sciences. It covers diverse range of topics including inorganic/organic/hybrid magnetic molecular ma- terials, multifunctional and/or switchable magnetic molecu- lar materials, molecular nanomagnets, nanostructural mo- lecular magnets, molecular spintronics and biomagnetism. Much research on molecular magnetism has been carried out in China both before and after we organized the Interna- tional Conference on Molecule-Based Magnets 2010 (ICMM 2010) in Beijing. 展开更多
关键词 earthquake risk stress state meta-instable state evolution of the temperature field synergism bending fault
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